TBA

Author: Beatriz Garcia Plana

Title: Tests of Lepton Flavour Universality using semitauonic B decays in the LHCb Experiment at CERN

Supervisors: Antonio Romero Vidal, Abraham Gallas Torreira

In this talk, I will review recent work on the understanding of deformations and generalised T-dualities which preserve the integrability of string sigma-models. As a guiding exemplar, I will focus on the so-called Homogeneous Yang-Baxter deformations, which are a class of deformations that interpolate between a sigma-model and its non-abelian T-dual. As a special case they capture the well-known TsT-transformations involving standard abelian T-duality. At the level of the low-energy string as well as worldsheet integrability it has been understood that many of the attractive features of TsT carry over to the generalised Yang-Baxter case. Using the framework of Double Field Theory, I will first show how one can easily understand Yang-Baxter deformations as solution-generating techniques of type II supergravity, and I will argue how a large web of transformations with the same feature can be more generally classified. In the second part of the talk, I will discuss how these deformations can be equivalently described on-shell in terms of a twisting of the worldsheet boundary conditions of the undeformed sigma-model. This feature makes it particularly efficient to employ integrable methods such as the classical spectral curve and its semi-classical quantisation to obtain energy corrections. This opens a route to study integrable deformations of AdS/CFT, and I will report on progress obtained for a Homogeneous Yang-Baxter deformation of the AdS5 x S5 superstring.

[This talk will not be broadcasted over Zoom unless specifically requested]

Título: Estudo de Rayos Cósmicos con un detector tipo Trasgo

Director: Juan Pablo Garzón Heydt

Abstract: The discovery of gravitational waves has opened a new experimental window into the Universe. The fact that the relevant physics is often out of equilibrium offers a golden opportunity for holography to make a unique impact on astrophysics and cosmology. I will review recent progress in this direction, with a focus on cosmological phase transitions and neutron star mergers. I will also discuss a new holographic framework to describe strongly coupled matter coupled to dynamical gravity. If time permits I will mention applications to baryogenesis, thermal inflation and primordial black holes. No prior knowledge of string theory or holography required.

https://zoom.us/j/97561282565?pwd=eE1mSFNqcnpLOWxiKy9JejRBendNQT09

Meeting ID: 975 6128 2565

Passcode: 738971

The gravitational-wave detections provided by the LIGO-Virgo network of Advanced interferometers, had a significant impact in many fields of science: astrophysics, cosmology, nuclear physics and fundamental physics. Compact binaries coalescence signals, the only type of signals detected so far, are only a small fraction of possible detectable gravitational waves. An interesting family of yet undetected signals, and the ones that I will consider in this talk, are the so-called continuous waves. The main sources of continuous signals are galactic, fast-spinning isolated neutron stars or potential dark matter candidates. In this talk, I will review some of the latest results from Advanced detector data in this field.

https://zoom.us/j/97561282565?pwd=eE1mSFNqcnpLOWxiKy9JejRBendNQT09

 

Meeting ID: 975 6128 2565

Passcode: 738971

The concept of isospin has been introduced to explain the apparent exchange symmetry between protons and neutrons. However, if the nuclear force were the same for neutrons and protons properties such as excitation energies and masses would depend only on the mass number A. Naturally, the Coulomb force breaks this degeneracy, but recent studies have shown that electromagnetic effects cannot account for all deviations, suggesting that other isospin-symmetry-breaking interactions are missing from current models. Recent experiments aiming to probe isospin symmetry in N~Z nuclei will be discussed.

https://zoom.us/j/97561282565?pwd=eE1mSFNqcnpLOWxiKy9JejRBendNQT09

 

Meeting ID: 975 6128 2565

Passcode: 738971

Marie Skłodowska-Curie Actions Postdoctoral Fellowships Online Master Class

 

Dr P. Sheard & C. Gavaud will prepare and deliver an online support programme over two half-days for MSCA Master Class participants for post-docs & supervisors on 8th July 2022, as per programme hereafter:

 

Audience: Candidates & Supervisors, Format: Webinar (timings are indicative)

 

09:25 | Connection/Registration

09:30 | Welcome and Introduction

09:45 | MSCA Postdoctoral Fellowships in context - Overview of rationale

10:15 | Planning your Proposal Submission

10:30 | The Proposal and its Requirements: Proposal Evaluation and What Evaluators Look For

10:45 | You as principal investigator: Collaborating with your supervisor for proposal preparation

11:00 | Coffee

11:15 | Key Tips for Excellence: Introduction to the Storyboard, Training Excellence

11:45 | Key Tips for Impact

12:15 | Key Tips for Implementation

12:45 | Q&A

13:00 | Close

 

MSCA PFs Proposal Reviews

We will check Part B of the proposal drafts using an established process which focuses on the areas of the specific IF evaluation criteria and make detailed comments on how to improve each aspect as necessary.

Among specific things we look at are:

• clarity of concept

• conformance with the key MSCA PF requirements

• justification of innovation and novelty

• research methodology, risk assessment and progress monitoring

• work plan description

• presentation and justification of the training aspects

• potential impacts

• resource justification

• suitability/credibility of the PI with respect to the MSCA requirements.

 

Once we have received the documents (proposal and CV) we will undertake the review and return the original document with comments using the document review in Word or ‘sticky note’ comments in pdf files. (Note: Please ensure the files are in either .doc(x) or .pdf and are open for commenting/reviewing.)

 

It is anticipated that up to 10 individual proposals will be provided with up to 2 reviews. After the first review an optional 30 minute on-line debrief will be offered to clarify and comments and ensure the applicant understands how to accommodate the feedback suggestions.

 

Timing:

We have defined 2 cut-off dates by when the candidates will need to send their proposals for review:

• Cut-off#1: On 28 July 2022

• Cut-off#2: On 5 September 2022 (with online debriefs latest on 9/09)

To register, send an email to: ricardojulio.rodriguez@usc.es

Abstract: Core collapse supernovae are among the most exciting events that we expect to observe in the future by gravitational-wave interferometers. They provide a unique multi-messenger opportunity with the combined emission of gravitational waves, neutrinos and electromagnetic waves. In this talk, I will focus on the current understanding of core-collapse GW signals and how they can be modelled in terms of normal oscillations modes of proto-neutron stars excited during the post-bounce phase before the onset of the SN explosion. The observation of such modes in the future by gravitational wave observatories (Virgo, LIGO) may allow us to infer the properties of proto-neutron stars and learn about the engine powering supernova explosions.

https://zoom.us/j/97561282565?pwd=eE1mSFNqcnpLOWxiKy9JejRBendNQT09

 Meeting ID: 975 6128 2565

Passcode: 738971

Abstract: We discuss a reformulation of QED in which matter and gauge fields are integrated out explicitly, resulting in a many-body Lorentz covariant theory of 0+1 dimensional worldlines describing super-pairs of spinning charges interacting through Lorentz forces. This provides a powerful, string inspired definition of amplitudes to all loop orders. In particular, one obtains a more general formulation of Wilson loops and lines, with ex- ponentiated dynamical fields and spin precession contributions, and worldline contour averages exactly defined through first quantized path integrals. We discuss in detail the attractive features of this formalism for high order perturbative computations. We show that worldline S-matrix elements, to all loop orders in perturbation theory, can be constructed to be manifestly free of soft singularities, with infrared (IR) divergences captured and removed by endpoint photon exchanges at infinity that are equivalent to the soft coherent dressings of the Dyson S-matrix proposed by Faddeev and Kulish. We discuss these IR structures and make connections with soft theorems, the Abelian ex-ponentiation of IR divergences and cusp anomalous dimensions.

Preprint: https://arxiv.org/abs/2206.04188

https://zoom.us/j/97561282565?pwd=eE1mSFNqcnpLOWxiKy9JejRBendNQT09

 

Meeting ID: 975 6128 2565

Passcode: 738971